package com.sky.service.impl;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;


import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
@Slf4j
public class OrderServiceImpl implements OrderService
{

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCatMapper shoppingCatMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    @Override
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO)
    {
        //1、处理各种业务异常（地址簿为空、购物车为空）
        Long addressBookId = ordersSubmitDTO.getAddressBookId();
        AddressBook addressBook = addressBookMapper.getById(addressBookId);
        if(addressBook == null)
        {
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        
        //查询当前用户的购物车数
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> shoppingCartList = shoppingCatMapper.list(shoppingCart);

        if(shoppingCartList == null || shoppingCartList.size() == 0)
        {
            //抛出业务异常
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }



        //2、向订单表中插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);//支付状态：未支付
        orders.setStatus(Orders.TO_BE_CONFIRMED);//订单状态：待支付
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());//收货人
        orders.setUserId(userId);
        orders.setAddress(addressBook.getDetail());

        orderMapper.insert(orders);

        //3、向订单明细表中插入多条数据

        List<OrderDetail> orderDetailList = new ArrayList<>();

        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();//订单明细对象
            BeanUtils.copyProperties(cart,orderDetail);
            orderDetail.setOrderId(orders.getId());//设置当前订单明细 关联的订单ID

            orderDetailList.add(orderDetail);

        }

        orderDetailMapper.insertBatch(orderDetailList);//批量插入

        //4、清空当前用户的购物车

        shoppingCatMapper.deleteByUserId(userId);

        //5、封装OrderSubmitVO
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();



        //TODO 下面代码本应写在 支付成功（paySuccess）方法中，但因本程序不能完成支付功能，因此写在了这里

        //通过WebSocket向客户端浏览器推送消息 type orderId content
        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(orders.getNumber());
        Map map = new HashMap();
        map.put("type",1);//1表示来单提醒 2表示客户催单
        map.put("orderId",ordersDB.getId());//订单ID
        map.put("content","订单号：" + orders.getNumber());
        //将Map容器中的内容转换为JSON格式的数据
        String jsonString = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(jsonString);

        return orderSubmitVO;
    }



    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }


    /**
     * 查询历史订单
     * @param pageNUm
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQuey4User(Integer pageNUm, Integer pageSize, Integer status)
    {
        PageHelper.startPage(pageNUm,pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setStatus(status);
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setPage(pageNUm);
        ordersPageQueryDTO.setPageSize(pageSize);

        Page<Orders> page =  orderMapper.pageQuery(ordersPageQueryDTO);

        ArrayList<OrderVO> list = new ArrayList<>();
        //查询订单明细，封装进orderVO
        if(page != null && page.size() > 0)
        {
            for (Orders order : page) {

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order,orderVO);

                //查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(order.getId());
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        
        return new PageResult(page.getTotal(),list);
    }


    /**
     * 根据ID查询订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id)
    {
        //查询订单
        Orders orders = orderMapper.getById(id);

        //查询对应的订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //封装到OrderVO中
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return  orderVO;
    }


    /**
     * 用户取消订单
     * @param id
     * @return
     */
    @Override
    public void userCancelById(Long id) throws Exception {
        //查询订单
        Orders ordersDB = orderMapper.getById(id);

        //判断订单状态是否存在
        if(ordersDB == null)
        {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if(ordersDB.getStatus() > 2)
        {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setStatus(ordersDB.getStatus());

        //订单处于代接单状态下需要退款
        if(orders.getStatus().equals(Orders.TO_BE_CONFIRMED))
        {
            //调用微信支付退款接口
            WeChatPayUtil weChatPayUtil1 = new WeChatPayUtil();
            weChatPayUtil1.refund(
                    ordersDB.getNumber(),//商户订单号
                    ordersDB.getNumber(),//商户退款单号
                    new BigDecimal(0.01),//退款金额,单位元
                    new BigDecimal(0.01));//原订单金额

            //修改支付状态为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        //修改订单状态
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);


    }




    /**
     * 再来一单
     * @param id
     */
    @Override
    public void repetition(Long id)
    {
        //获取用户ID
        Long userId = BaseContext.getCurrentId();

        //根据订单ID获取订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息 重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());


        //将购物车数据批量插入到数据库
        shoppingCatMapper.insertBatch(shoppingCartList);
    }





    /**
     * 条件查询订单
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO)
    {
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //部分订单需要额外返回菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(),orderVOList);
    }
    //获取菜品信息
    private List<OrderVO> getOrderVOList(Page<Orders> page)
    {
        //自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if( !CollectionUtils.isEmpty(ordersList) )
        {
            for (Orders orders : ordersList) {
                //将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);

                String orderDishes = getOrderDishesStr(orders);
                //将菜品信息封装到OrderVO中，并加入到List集合中
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }

        return orderVOList;
    }
    /**
     * 根据订单ID，获取菜品信息--字符串
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders)
    {
        //查询订单菜品详细信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将每一条菜品详细信息，拼接为字符串（格式：宫保鸡丁*3）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        //将订单对应的所有菜品信息拼接在一起
        return String.join("",orderDishList);
    }





    /**
     * 各个状态的订单数量统计
     * @return
     */
    @Override
    public OrderStatisticsVO statistics()
    {
        //根据状态查询出各个状态的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);//待接单数量
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);//待派送数量
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);//派送中数量

        //将查询到的数据封装到OrderStatisticsVO中 响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO;
    }


    /**
     * 接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO)
    {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }


    /**
     * 拒单
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        //查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());

        //订单只有存在并且处于2（待接单）状态才可拒单
        if(ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED))
        {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //支付状态
        Integer orderStatus = ordersDB.getStatus();
        //如果用户已支付，需要进行退款
        if(orderStatus == Orders.PAID)
        {
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),//商户订单号
                    ordersDB.getNumber(),//商户退单号
                    new BigDecimal(0.01),//退单金额
                    new BigDecimal(0.01));//原订单金额

            log.info("申请退款 : {}",refund);
        }


        //拒单需要退款 根据id跟新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);//6 已取消
        orders.setCancelReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);

    }


    /**
     * 商家取消订单
     * @param ordersCancelDTO
     */
    // TODO 该功能 代码正确但因微信支付相关配置文件缺失，导致了空指针异常 不能实现完整该功能
    //上述问题又不存在了，具体原因有待确定
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        //根据ID查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        //如果用户 已支付 需要为其退款
        if(ordersDB.getPayStatus().equals(Orders.PAID))
        {
            String refund =  weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));

            log.info("申请退款 ： {}",refund);
        }

        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);

    }


    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id)
    {
        //根据ID查询订单
        Orders ordersDB = orderMapper.getById(id);

        //判断订单是否为 3 已接单（CONFIRMED）才可派送
        if( !ordersDB.getStatus().equals(Orders.CONFIRMED))
        {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //更新订单状态为派送中
        Orders orders = new Orders();
        orders.setId(id);
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);

    }


    /**
     * 完成订单
     * @param id
     */
    @Override
    public void complete(Long id)
    {
        //根据ID查询订单
        Orders ordersDB = orderMapper.getById(id);

        //判断订单是否为 4 派送中（DELIVERY_IN_PROGRESS）才可完成订单
        if( !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS))
        {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //更新订单状态为 完成
        Orders orders = new Orders();
        orders.setId(id);
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);

    }


    /**
     * 客户催单
     * @param id
     */
    @Override
    public void reminder(Long id)
    {
        //根据ID查询订单
        Orders ordersDB = orderMapper.getById(id);

        //检验订单是否存在
        if(ordersDB == null)
        {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap();
        map.put("type",2);//1表示来单提醒  2表示用户催单
        map.put("orderId",id);
        map.put("content", "订单号：" + ordersDB.getNumber());

        String json = JSON.toJSONString(map);

        //通过WebScoket向客户端推送消息
        webSocketServer.sendToAllClient(json);


    }

}
